Heating-furnace



(No Model.)

H. W. MICHAEL HEATING FURNACE. No. 269,873. Patented Jan. 2,1883.

UNTTED STATES HENRY \V. MICHAEL, Oh DENVER, COLORADO.

PATENT Gr mes.

HEATING-FURNACE.

SPECIFICATION forming part of Letters Patent No. 269,873, dated January 2, l8fi3.

Application filed April Ill, 1882. (No model.) v

To all 'whom it may concern:

Be it known that I, HENRY W. MICHAEL, a

citizen of the United States of America, residing at Denver, in the county of Arapahoe and State of Colorado, have invented certain new and useful Improvements in Heatingl urnaces; and I do hereby declare the following to he a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it'ap'pertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in furnaces for heating dwellings, in which the air is heated within an inclosing drum or case connectin g with the hot-airconducting-pipes; and the object of my improvement is to provide a large heating-surface for the air directly within the combustion-chamber, and to deliver the air in large volumes intensely heated for direct entrance into the distributing-pipes.

Referring to the accompanying drawings, Figure 1 represents a view in perspective of a heating-furnace embracing my improvement, and Fig. 2 a vertical section of the same.

The fire-pot B is surrounded by a casting forming the radiator and combustion-chamber B, within which depends an egg or pear shaped chamber, 0, having a large top opening, 0, and its entire surface within and exposed to direct contact with the products of combustion, and communicating at the top by the opening 0 and at the bottom by inclined tubes D with the hot-air chamber, whereby a large and effective air-heating surface is obtained within the combustion-chamber. The casting which forms the combustion-chamber B is of semicircular form at the top, and tapers to a less diameter to its junction with the fire-pot, so as to give increased radiating-surface and allow of the use of an air-heating chamber having its walls curved from the neck-opening c to its lower end, exposing the whole curved surface of the interior radiator to the products of combustion, giving intense heat to the air, and delivering it through the top opening, 0, in large volume for direct entrance into the distributin g-pipes.

The case or drum A can he set in brick or upon a cast-iron base, G, upon which the ashchamber E is supported. The base G is provided with openings 9 for the ingress of cold air within the chamber of the drum or case, from the top of which the usual pipes, a, conduct the heated air to the several rooms of the dwellin The lire-pot sets upon and projects below the top of the ash-chamber, and a grate, E, is suitably supported upon ledgesff on the inner walls of the ash-chamber, in near proximity to the bottom of the fire-pot. The grate may be drawn out through the ash-chamber door H to clear it, and for this purpose is provided with a hole, f, for the insertion of the hooked end of the poker. The front of that portion of the fire-pot which projects within v the ash-chamber is open, as at c, for the insertion of the poker to free the grate of ashes. This construction is well adapted forcoals which burn to ashes, but any suitable construction of gratemay be used. The ash-chamber door has an air-regulating damper, h, and is provided with an opening, 2', closed by a door, through which to operate the poker. I

I is the feed-opening, the door I of which has an air-regulating damper, and b is the smoke-pipe of the combustion-chamber.

The case or drum I prefer to make in three horizontal sections, and to join and support them by circular flanged collars J, as shown in Fig. 2.

The exterior radiator forming the combustion-chamber is constructed in two sections with lapjoining, and the egg-shaped interior radiator, forming the air-chamberO, has an open top neck, 0, which projects through an opening into the top of the exterior radiator into the hot-air chamber of the inclosingcase. Short tubes Dexteud in inclined positions across the top of the fire-pot into openings in the walls of the air-heating chamber 0 and the tire-pot, so that the cold air entering at the base-openings y will pass up in contact with the walls of the exterior radiator, and through the short inclined tubes D into the bottom of the interior radiator in direct contact with its interior walls, and thence out at the top opening, 0, into the top of the chamber formed by the case or drum, whereby the air is intensely heated and delivered freely at a point where it passes directly into distributing-pipes. 1n the arrangement of the tubes D shown they serve by collars abutting against the inner walls of the fire-pot and the outer walls of the interior radiator to support the latter; but it may be suspended from the neck 0, or in any other suitable way. The neck-opening c occupies a central relation to the hot-air distributing-pipes a, and its area is such as to allow of the free exit of the air from the chamber (l, the bottom of which extends to or near the top of the fire-pot.

I claimlhe combination, in a hot-air-fnrnace, of the egg-shaped casting 0, having an open top collar, 0, with the exterior radiator and the inclined cast-iron tubes 1), having shoulders at each end, and the fire-pot, the said shoulders abutting against theinncr walls of the tire-pot I; and against the outer walls of the egg-shaped chamber, substantially as described, for the purpose specified.

In testimony whereof I have at'fixed my signature in presence of two witnesses.

HENRY W. MICHAEL. Witnesses:

ioBER'r GIVEN, OLIVER A. WIIrr'rEMORE. 

